The celebrity fat feud between Alyssa Milano and comedian Jay Mohr began before Christmas, and it's still going on Twitter!

The saga started when the two stars were presenters at NASCAR’s Sprint Cup Series awards ceremony in Las Vegas.

Afterward, Mohr made some wisecracks on a radio show about the actress’ weight. According to the New York Daily News, Mohr described her as “tiny. In height… It seems like she had a baby, and said, ‘I don’t really give a (darn)’… I read it on her gut.”

[Credit: FameFlyNet]

He went on to refer to her as “Melissa what’s-her-name,” while adding, “Somebody sat in the director’s chair and was not wearing Spanx and I was like, Jesus Christ.”

Milano, who is hosting the new season of “Project Runway All Stars,” offered an epic comeback on Christmas day, tweeting, "@jaymohr37 So sorry you felt the need to publicly fat-shame me. Be well and God Bless. Please send my love to your beautiful wife."

.@jaymohr37 So sorry you felt the need to publicly fat-shame me. Be well and God Bless. Please send my love to your beautiful wife.